<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<bindings xmlns="http://www.mozilla.org/xbl"><binding id="empty"><content></content></binding></bindings>

<style>

.bef:before { content: counter(c); }

.fl:first-letter { }

</style>

<script>

function boom()
{
  document.getElementById("xblize").style.MozBinding = "url('#empty')";
}

</script>
</head>

<body onload="boom();">

<div class="fl"><span class="bef" id="xblize"></span><span class="bef"></span></div>

</body>
</html>
